Square.



No. 600,030. Patented Aug. 20, |001.

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JAMES A. WRAY, CF CHICAGO, ILLINOIS.

SQUARE.

SPECIFXCATON forming part of Letters Patent No. 680,830, dated August20, 1901.

Application filed July 5,1900. Serial llo. 22,546. (No model.)

To all?, whom it may concern.-

Be it known that I, JAMESA. VRAY, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Squares, of which thefollowing is a specification, reference being had to the accompanyingdrawings.

My invention relates to separable squares, and has for its object toprovide a new and improved construction of separable squares in whichthe parts of the square are firmly secured together, but maynevertheless be readily separated when desired. I accomplish this objectas hereinafter specified and as illustrated in the drawings.

That which I regard as new will be set forth in the claims.

Referring to the drawings, Figure 1 is a plan view of the square. Fig. 2is a section on line 2 2 of Fig. 1 inverted. Fig. 3 is a section on line3 3 of Fig. 1 inverted. Fig. 4 is a section on line 4 4 of Fig. 1inverted. Fig. 5 is an enlarged detail illustratingthe operation of thelocking devices. Fig. 6 is a similar View, and Fig. 7 is a section online 7 7 of Fig. 5.

The square is composed of two arms 8 9, respectively, the arm 8 beingstraight and being provided near one end with a broad channel havingrabbet-grooves 10 11 at its edges, as shown in Fig. 3. The groove 10extends to the end of the arm S, as illustrated in dotted lines in Fig.1; but the groove 11 terminates at a point 12, removed from the end ofsaid arm by the width of the arm 9, as shown in dotted lines in Fig. 1.This is due to the fact that the metal of the arm 8 from the point 12 tothe adjacent end of the arm is cut away, so that the tongue of the arm9, hereinafter described, may be fitted to the arm 8 and lie flush with.the surface thereof. The inner side edge of the arm 8 from the point 12to the adjacent end thereof is beveled, as shown at 13 in Fig. 2, for apurpose hereinafter set forth.

As shown in Fig. 1, the arm 9 is provided with a tongue 14, arranged atright angles thereto, the thickness of said tongue being such that whenit is tted in the channel in the arm 8 its surface is iiush with thesurface of said arm. Said tongue is of. suitable width to fit in saidchannel and is provided at its edges with ribs or tongues 15 16, whichfit in the rabbet-grooves 10 11. The end of the tongue 14 preferably isrounded, as shown in Figs. 1, 5, and 6, and iits closely to the innerend of the channel, which is of corresponding shape. The tongue 14 isformed by cutting away the under side of the arm 9 to make the tongue ofproper thickness, and that portion of the arm 9 which lies opposite thebeveled edge 13 of the arm 8 is undercut or is provided with adovetailed groove 17, as shown in Fig. 2, so that when the parts arefitted together the edge 13 of the arm 8 slides in the groove 17 of thearm 9, as shown in Fig. 2.

When the parts are assembled, the ribs 15 16 at the edges of the tongue14 enter the grooves 10 11, respectively, the tongue 14 being movedlengthwise into the channel in the arm S. When the tongue 14 has beenmoved far enough, the beveled edge 13 enters the groove 17 and movesinto said groove -until the tongue 14 has moved entirely into itssocket, when the parts will be in the position shown in Fig. 1. By thisconstruction the arm 9 engages the arm S at both sides or surfacesthereof, securing a very iirm union of the parts, as is necessary in aninstrument of this character. In order to prevent the accidentaldisplacement of the parts of the square, a locking device isprovided,consisting of a screw 18, fitted in a suitable socket in thearm S near one edge of the channel therein, said screw projecting intoone of the rabbet-grooves, as 10. (See Fig. 5.) Said screw is providedwith a cut-out portion 19, which may be turned into alinement with therabbet-groove 10 by turning the screw, and when in such position forms apart of said groove and does not interfere with the movement of thetongue 14 therein. Said tongue is provided with a concave recess 2O inone of its edges, so placed that when the tongue 14 is in its innermostposition said recess will lie opposite the screw 18, as shown in Fig. 5.

TWhen assembling or separating the parts, the screw 18 is turned to theposition shown in Figs. 4 and 6, the cut-out portion 19 being then inalinelnent with the groove 10, permitting the tongue 14 to move in orout, as the case may be. When the parts have been IOO of using adovetailed groove 17 and a beveled y edge 13 a rabbet-groove with acorresponding tongue at the edge of the arm 8 may bc employed.

That which I claim as my invention, and desire to secure by LettersPatent, is-

1. A separable square composed of two members, one having a channel onone surface, extending longitudinally of said meniber and formed withgrooves along its sides, one side of said channel terminating at the endof the member in which it is formed and the other side at a point ashort distance from said end, and the other member having a tongue onone surface adapted to fit in said channel and whose side edges areadapted to fit in said grooves.

2. A separable square composed of two members, one having a beveled sideedge on one surface and a channel on the other surface, extendinglongitudinally of said member and having grooves along its sides, oneside of said channel terminating at the end of the member in which it isformed and the other side at a point a short distance from said end, andthe other member having a groove on one surface adapted to receive saidbeveled edge and having a tongue on the other surface adapted to iit insaid channel vand whose side edges are adapted to fit in the groovesalong the sides of said channel.

3. A separable square composed of two members, one having a rabbetedchannel on one surface, extending longitudinally of said member, oneside of said channel terminating at the-end of the member in which it isformed and the other side at a point a short distance from said end, andthe other member having a tongue on one surface whose side edgesy areformed with ribs adapted to fit in the rabbet-grooves along the sides ofsaid channel.

4. A separable square composed of two members, one having a beveled sideedge on one surface and a rabbeted channel on the other surface,extending longitudinally of said member, one side of said channelterminating at the end of the member in which it is formed and the otherside at a p'oint a short distance from said end, and. the other memberhaving a groove on one surface adapted to receive said beveled edge andhaving a tongue on the other surface whose side edges are formed withribs adapted to fit in the rabbet-grooves along the sides of saidchannel.

5. A separable square composed of two members, one having a rabbetedchannel on one surface, extending longitudinally of said member,provided with a rounded end and having one side terminating at the endof the member in which it is formed and the other side at a point ashort distance from said end, and the other member having a tongue onone surface whose end is rounded and whose side edges are formed withribs, the rounded end of said tongue adapted to fit in the rounded endof said channel and said ribs adapted to iit in the rabbet-grooves alongthe sides of said channel.

6. A separable square, composed of two members, one having a channelon`one surface, extending longitudinally of said member and formed withgrooves along its sides, one side of said channel terminating at the endof Ithe member in which it is formed and the other side at a point ashort distance from said end, and the other member having a tongue onone surface adapted to it in said channel and whose side edges areadapted to fit in said grooves, and means for locking the two membersagainst accidental separation.

7. A separable square composed of two A members, one having a beveledside edge on one surface and a lchannel on the other surface, extendinglongitudinally of said member and having grooves along its sides, oneside of said channel terminating at the end of the member in which it isformed and the other side at a point a short distance from said end, andthe other member having a groove on one surface adapted to receive saidbeveled edge and having a tongue on the other surface adapted to fit insaid channel and whose side edges are adapted to fit in the groovesalong the sides of said channel, and means for locking the two membersagainst accidental separation.

JAM-ES A. VVRAY.

Vitnesses:

JOHN L. JACKSON, ALBERT H. ADAMS.

IOD

